Unusual Pseudogap Features Observed in Iron Oxypnictide Superconductors

被引：10

作者：

Ishida, Yukiaki ^{[1
]}

Shimojima, Takahiro ^{[2
]}

Ishizaka, Kyoko ^{[2
]}

Kiss, Takayuki ^{[2
]}

Okawa, Mario ^{[2
]}

Togashi, Tadashi ^{[1
]}

Watanabe, Shuntaro ^{[2
]}

Wang, Xiaoyang ^{[3
]}

Chen, Chuangtian ^{[3
]}

Kamihara, Yoichi ^{[4
,5
]}

Hirano, Masahiro ^{[4
,6
]}

Hosono, Hideo ^{[4
,5
,6
]}

Shin, Shik ^{[1
,2
]}

机构：

[1] RIKEN SPring 8 Ctr, Sayo, Hyogo 6795148, Japan

[2] Univ Tokyo, ISSP, Chiba 2778561, Japan

[3] Chinese Acad Sci, Tech Inst Phys & Chem, Beijing 100080, Peoples R China

[4] Tokyo Inst Technol, Frontier Res Ctr, JST, ERATO SORST,Midori Ku, Yokohama, Kanagawa 2268503, Japan

[5] Tokyo Inst Technol, Frontier Res Ctr, Midori Ku, Yokohama, Kanagawa 2268503, Japan

[6] Tokyo Inst Technol, Mat & Struct Lab, Midori Ku, Yokohama, Kanagawa 2268503, Japan

来源：

JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN | 2008年 / 77卷

关键词：

Iron oxypnicite superconductors; pseudogap; photoemission spectroscopy;

D O I：

10.1143/JPSJS.77SC.61

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

We present angle-integrated photoemission spectroscopy (PES) study of LaOFeAs: F (T-c = 26 K) and LaOFeP:F (T-c = 5 K) using He I line (h nu = 21.2 eV) and laser (h nu = 6.994 eV) as excitation light sources. We find quantitatively consistent results between the He I and the laser PES measurements: LaFeAsO:F exhibits a temperature-dependent pseudogap as large as similar to 0.1 eV at 300 K, whereas LaFePO:F exhibits a similar to 20-meV pseudogap. We discuss possible origin of the T-dependent pseudogap specifically observed in LaFeAsO: F through comparison with other materials that exhibit unusual T-dependent pseudogaps.

引用

页码：61 / 64

页数：4

共 29 条

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